
PROJECTS: Amateur Scientist
Little Chip,
A mini course in op amps — the
magical key to the analog world
Big Gain
Written and photographed by Forrest M. Mims III
100 makezine.com
While we live in the digital era, analog
electronics still play a vital role. Analog circuits
transform varying voltages and current into
signals that digital systems can access and
process. Power supplies, which transform wall
power into the voltage and current required by
many digital systems, are also analog in nature.
Transistors are key to both analog and digital
circuits. An ancient junction transistor can be
used as an analog amplifier, and it can function in
a digit ...